Uplink pre-equalization using MMSE prediction for TDD/MC-CDMA systems

Yoshikazu Takei, Tomoaki Ohtsuki

研究成果: Conference contribution

4 被引用数 (Scopus)

抄録

Recently, multi-carrier code-division multiple-access (MC-CDMA) has attracted much attention. To make smoothly connection with a base station (BS), time division duplex (TDD) systems using the reciprocity of uplink and downlink in the same frequency band is considered. If the coherence time is large compared with the duplexing time, TDD systems can provide the channel characteristics of uplink from that of downlink. Thus, the channel distortion can be compensated in advance as a pre-equalization at mobile terminals (MTs). The pre-equalization technique using zero-forcing equalization (ZFE) was proposed for the TDD/MC-CDMA system. The channel parameters obtained from the last pilot (LP) symbol in the downlink frame have the highest time correlations with the uplink channel parameters. Therefore, they can be used as the channel parameters of all the symbols in the following frame. However, when the coherence time is not so large compared with the duplexing time, it is expected that the system suffers from the channel mismatch by time-selective fading. In this paper, we propose a pre-equalization using MMSE channel prediction for TDD/MC-CDMA. As a derivation of the pre-equalization coefficients, we employ ZFE, Controlled Equalization (CE), and Minimum Mean Square Error Equalization (MMSEE). Simulation results show that the proposed channel prediction techniques are effective on time-selective fading channels.

本文言語English
ホスト出版物のタイトル2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005
ページ291-295
ページ数5
出版ステータスPublished - 2005 12月 1
イベント2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005 - Berlin, Germany
継続期間: 2005 9月 112005 9月 14

出版物シリーズ

名前IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
1

Other

Other2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2005
国/地域Germany
CityBerlin
Period05/9/1105/9/14

ASJC Scopus subject areas

  • 電子工学および電気工学

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